A.單值
B.等距分組
C.異距分組
D.復(fù)合分組
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A.各個(gè)個(gè)體的名稱與指標(biāo)數(shù)值
B.各組變量值與次數(shù)
C.各組變量值與其方差
D.各組均值與方差
A.簡單隨機(jī)抽樣
B.系統(tǒng)抽樣
C.分層抽樣
D.整群抽樣
A.必須相同
B.必須不同
C.可以相同,也可以不同
D.完全沒有關(guān)系
最新試題
One rule that must always be followed in constructing frequency distributions is that ().
Which of the following statements is not true?()
最能反映離散程度的指標(biāo)是()
品合格率指標(biāo)是()
變量數(shù)列中,各組頻率之和應(yīng)()
A cumulative frequency distribution would provide().
常用的長期趨勢測定的方法有哪些?各有什么特點(diǎn)?
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a ().
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于()
在組距數(shù)列中,下限就是()